Social Media On Mobile Devices

I'm thinking this one through, but inspired by Andrew Davis at Tipping Point Labs' tweet about Wired's new iPad application, I'd like to explore the idea of how do you engage differently with your network on new mobile tools?

Just as content creators had to evolve new content for radio, TV and then the Internet. As more consumers acquire smart phones, companies have developed new content for those devices. This time however, there's a new twist to the process of developing content. How do you engage using a mobile device differently than you would a desktop device?

From FourSquare to mobile Facebook, what do you do differently with your mobile devices when it comes to connecting with your network?